61-101-00802.EF2 (REV. G) CH. 2
January 7, 2015 Page 23 of 44
D. Test Procedure
(1) Set the test set ON/OFF switch to ON.
(2) Set the CAP SIM (pF) 100’s to 1. Set the 10’s thumbwheels to 5 for
all 1900 models.
(3) Press and hold the PRESS TO READ CAP (pF) pushbutton while
adjusting CAP SIM (pF) control knob to obtain a test set reading of
156.5 pF (for UA or UB) or a reading of 159.4 pF (for UC or UE)
(4) Rotate the TEST FUNCTION switch to IND AMP.
(5) Connect the aircraft battery.
(6) Close the circuit breakers.
(7) Turn the aircraft battery ON/OFF switch ON.
Caution: Do not tap bezel of instrument to vibrate. To remove friction,
gently tap adjacent panel or rear housing of indicator before
taking readings.
(8) Verify that the indicator reads zero lbs.
(9) If reading is not zero, adjust EMP 1/E 1 or E located at rear of the
indicator.
(10) If the indicator will not give a zero reading, replace the indicator.
(11) Rotate the TEST FUNCTION switch to CAP SIM CAL (NORM SYS).
(12) Set the 200 (pF)/1000 (pF) switch to 1000 (pF).
(13) Set the CAP SIM (pF) 100’s thumbwheel to 2. Set the 10’s
thumbwheel to 6 (UA or UB) or to 9 (UC or UE).
(14) Push and hold the PRESS TO READ CAP (pF) pushbutton while
adjusting CAP SIM (pF) control knob to obtain a test set reading of
260.9 pF (for UA or UB) or 295 pF (UC or UE).
(15) Release the pushbutton.
(16) Rotate the TEST FUNCTION switch to IND AMP.
(17) The indicator will read 1400 lbs (UA or UB) or 1600 lbs (UC or UE).
(18) If the indicator does not show 1400 (UA or UB) or 1600 (UC or UE),
adjust FULL adjustment located at rear of the indicator.
(19) If the indicator still does not give the appropriate reading, replace the
indicator.
Note: The following “Aux Empty Adjustment” is applicable for serial
numbers UC and UE only. For serial numbers UA or UB, skip
to step 31.
(20) Rotate the TEST FUNCTION switch to CAP SIM CAL (NORM SYS).
(21) Set the 200 (pF)/1000 (pF) switch to 200 (pF).
(22) Set the CAP SIM (pF) 100’s thumbwheel to “-“. Set the 10’s
thumbwheel to 6.
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